#include<stdio.h>
int main() {
	int year;
	scanf("%d", &year);
	if ((year % 4 == 0 && year % 100 != 0) || ( year % 400 == 0)) {
		printf("%d是闰年", year);
	} else {
		printf("%d不是闰年", year);
	}
	return 0;
}
